]>
Commit | Line | Data |
---|---|---|
0a8165d7 | 1 | /* |
6b4ea016 JK |
2 | * fs/f2fs/dir.c |
3 | * | |
4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
5 | * http://www.samsung.com/ | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/fs.h> | |
12 | #include <linux/f2fs_fs.h> | |
13 | #include "f2fs.h" | |
398b1ac5 | 14 | #include "node.h" |
6b4ea016 | 15 | #include "acl.h" |
8ae8f162 | 16 | #include "xattr.h" |
6b4ea016 JK |
17 | |
18 | static unsigned long dir_blocks(struct inode *inode) | |
19 | { | |
09cbfeaf KS |
20 | return ((unsigned long long) (i_size_read(inode) + PAGE_SIZE - 1)) |
21 | >> PAGE_SHIFT; | |
6b4ea016 JK |
22 | } |
23 | ||
38431545 | 24 | static unsigned int dir_buckets(unsigned int level, int dir_level) |
6b4ea016 | 25 | { |
bfec07d0 | 26 | if (level + dir_level < MAX_DIR_HASH_DEPTH / 2) |
38431545 | 27 | return 1 << (level + dir_level); |
6b4ea016 | 28 | else |
bfec07d0 | 29 | return MAX_DIR_BUCKETS; |
6b4ea016 JK |
30 | } |
31 | ||
32 | static unsigned int bucket_blocks(unsigned int level) | |
33 | { | |
34 | if (level < MAX_DIR_HASH_DEPTH / 2) | |
35 | return 2; | |
36 | else | |
37 | return 4; | |
38 | } | |
39 | ||
ebfa7322 | 40 | static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = { |
6b4ea016 JK |
41 | [F2FS_FT_UNKNOWN] = DT_UNKNOWN, |
42 | [F2FS_FT_REG_FILE] = DT_REG, | |
43 | [F2FS_FT_DIR] = DT_DIR, | |
44 | [F2FS_FT_CHRDEV] = DT_CHR, | |
45 | [F2FS_FT_BLKDEV] = DT_BLK, | |
46 | [F2FS_FT_FIFO] = DT_FIFO, | |
47 | [F2FS_FT_SOCK] = DT_SOCK, | |
48 | [F2FS_FT_SYMLINK] = DT_LNK, | |
49 | }; | |
50 | ||
6b4ea016 JK |
51 | static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = { |
52 | [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE, | |
53 | [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR, | |
54 | [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV, | |
55 | [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV, | |
56 | [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO, | |
57 | [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK, | |
58 | [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK, | |
59 | }; | |
60 | ||
510022a8 | 61 | void set_de_type(struct f2fs_dir_entry *de, umode_t mode) |
6b4ea016 | 62 | { |
6b4ea016 JK |
63 | de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT]; |
64 | } | |
65 | ||
675f10bd CY |
66 | unsigned char get_de_type(struct f2fs_dir_entry *de) |
67 | { | |
68 | if (de->file_type < F2FS_FT_MAX) | |
69 | return f2fs_filetype_table[de->file_type]; | |
70 | return DT_UNKNOWN; | |
71 | } | |
72 | ||
38431545 JK |
73 | static unsigned long dir_block_index(unsigned int level, |
74 | int dir_level, unsigned int idx) | |
6b4ea016 JK |
75 | { |
76 | unsigned long i; | |
77 | unsigned long bidx = 0; | |
78 | ||
79 | for (i = 0; i < level; i++) | |
38431545 | 80 | bidx += dir_buckets(i, dir_level) * bucket_blocks(i); |
6b4ea016 JK |
81 | bidx += idx * bucket_blocks(level); |
82 | return bidx; | |
83 | } | |
84 | ||
6b4ea016 | 85 | static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, |
0b81d077 | 86 | struct fscrypt_name *fname, |
6e22c691 JK |
87 | f2fs_hash_t namehash, |
88 | int *max_slots, | |
4e6ebf6d JK |
89 | struct page **res_page) |
90 | { | |
91 | struct f2fs_dentry_block *dentry_blk; | |
92 | struct f2fs_dir_entry *de; | |
7b3cd7d6 | 93 | struct f2fs_dentry_ptr d; |
4e6ebf6d JK |
94 | |
95 | dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page); | |
7b3cd7d6 | 96 | |
d8c6822a | 97 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
6e22c691 | 98 | de = find_target_dentry(fname, namehash, max_slots, &d); |
4e6ebf6d JK |
99 | if (de) |
100 | *res_page = dentry_page; | |
101 | else | |
102 | kunmap(dentry_page); | |
103 | ||
4e6ebf6d JK |
104 | return de; |
105 | } | |
106 | ||
0b81d077 | 107 | struct f2fs_dir_entry *find_target_dentry(struct fscrypt_name *fname, |
6e22c691 JK |
108 | f2fs_hash_t namehash, int *max_slots, |
109 | struct f2fs_dentry_ptr *d) | |
6b4ea016 JK |
110 | { |
111 | struct f2fs_dir_entry *de; | |
5d0c6671 | 112 | unsigned long bit_pos = 0; |
5d0c6671 | 113 | int max_len = 0; |
0b81d077 JK |
114 | struct fscrypt_str de_name = FSTR_INIT(NULL, 0); |
115 | struct fscrypt_str *name = &fname->disk_name; | |
6b4ea016 | 116 | |
7b3cd7d6 JK |
117 | if (max_slots) |
118 | *max_slots = 0; | |
119 | while (bit_pos < d->max) { | |
120 | if (!test_bit_le(bit_pos, d->bitmap)) { | |
5d0c6671 | 121 | bit_pos++; |
bda19076 | 122 | max_len++; |
5d0c6671 JK |
123 | continue; |
124 | } | |
bda19076 | 125 | |
7b3cd7d6 | 126 | de = &d->dentry[bit_pos]; |
6e22c691 | 127 | |
a4a13f58 CY |
128 | if (unlikely(!de->name_len)) { |
129 | bit_pos++; | |
130 | continue; | |
131 | } | |
132 | ||
6e22c691 JK |
133 | /* encrypted case */ |
134 | de_name.name = d->filename[bit_pos]; | |
135 | de_name.len = le16_to_cpu(de->name_len); | |
136 | ||
137 | /* show encrypted name */ | |
138 | if (fname->hash) { | |
0c0b471e | 139 | if (de->hash_code == cpu_to_le32(fname->hash)) |
6e22c691 JK |
140 | goto found; |
141 | } else if (de_name.len == name->len && | |
142 | de->hash_code == namehash && | |
143 | !memcmp(de_name.name, name->name, name->len)) | |
4e6ebf6d JK |
144 | goto found; |
145 | ||
bda19076 | 146 | if (max_slots && max_len > *max_slots) |
5d0c6671 | 147 | *max_slots = max_len; |
bda19076 | 148 | max_len = 0; |
81e366f8 | 149 | |
5d0c6671 | 150 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); |
6b4ea016 JK |
151 | } |
152 | ||
153 | de = NULL; | |
6b4ea016 | 154 | found: |
7b3cd7d6 | 155 | if (max_slots && max_len > *max_slots) |
5d0c6671 | 156 | *max_slots = max_len; |
6b4ea016 JK |
157 | return de; |
158 | } | |
159 | ||
160 | static struct f2fs_dir_entry *find_in_level(struct inode *dir, | |
6e22c691 | 161 | unsigned int level, |
0b81d077 | 162 | struct fscrypt_name *fname, |
6e22c691 | 163 | struct page **res_page) |
6b4ea016 | 164 | { |
6e22c691 JK |
165 | struct qstr name = FSTR_TO_QSTR(&fname->disk_name); |
166 | int s = GET_DENTRY_SLOTS(name.len); | |
6b4ea016 JK |
167 | unsigned int nbucket, nblock; |
168 | unsigned int bidx, end_block; | |
169 | struct page *dentry_page; | |
170 | struct f2fs_dir_entry *de = NULL; | |
171 | bool room = false; | |
4e6ebf6d | 172 | int max_slots; |
6e22c691 JK |
173 | f2fs_hash_t namehash; |
174 | ||
5d2b42ed SL |
175 | if(fname->hash) |
176 | namehash = cpu_to_le32(fname->hash); | |
177 | else | |
178 | namehash = f2fs_dentry_hash(&name); | |
6b4ea016 | 179 | |
38431545 | 180 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
181 | nblock = bucket_blocks(level); |
182 | ||
38431545 JK |
183 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
184 | le32_to_cpu(namehash) % nbucket); | |
6b4ea016 JK |
185 | end_block = bidx + nblock; |
186 | ||
187 | for (; bidx < end_block; bidx++) { | |
188 | /* no need to allocate new dentry pages to all the indices */ | |
43f3eae1 | 189 | dentry_page = find_data_page(dir, bidx); |
6b4ea016 | 190 | if (IS_ERR(dentry_page)) { |
42d96401 JK |
191 | if (PTR_ERR(dentry_page) == -ENOENT) { |
192 | room = true; | |
193 | continue; | |
194 | } else { | |
195 | *res_page = dentry_page; | |
196 | break; | |
197 | } | |
6b4ea016 JK |
198 | } |
199 | ||
6e22c691 JK |
200 | de = find_in_block(dentry_page, fname, namehash, &max_slots, |
201 | res_page); | |
6b4ea016 JK |
202 | if (de) |
203 | break; | |
204 | ||
205 | if (max_slots >= s) | |
206 | room = true; | |
207 | f2fs_put_page(dentry_page, 0); | |
208 | } | |
209 | ||
88c5c13a JK |
210 | /* This is to increase the speed of f2fs_create */ |
211 | if (!de && room) { | |
212 | F2FS_I(dir)->task = current; | |
213 | if (F2FS_I(dir)->chash != namehash) { | |
214 | F2FS_I(dir)->chash = namehash; | |
215 | F2FS_I(dir)->clevel = level; | |
216 | } | |
6b4ea016 JK |
217 | } |
218 | ||
219 | return de; | |
220 | } | |
221 | ||
e7ba108a SL |
222 | struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir, |
223 | struct fscrypt_name *fname, struct page **res_page) | |
6b4ea016 | 224 | { |
6b4ea016 JK |
225 | unsigned long npages = dir_blocks(dir); |
226 | struct f2fs_dir_entry *de = NULL; | |
6b4ea016 JK |
227 | unsigned int max_depth; |
228 | unsigned int level; | |
6e22c691 JK |
229 | |
230 | if (f2fs_has_inline_dentry(dir)) { | |
42d96401 | 231 | *res_page = NULL; |
e7ba108a | 232 | de = find_in_inline_dir(dir, fname, res_page); |
6e22c691 JK |
233 | goto out; |
234 | } | |
622f28ae | 235 | |
42d96401 JK |
236 | if (npages == 0) { |
237 | *res_page = NULL; | |
6e22c691 | 238 | goto out; |
42d96401 | 239 | } |
6b4ea016 | 240 | |
6b4ea016 | 241 | max_depth = F2FS_I(dir)->i_current_depth; |
1f6fa261 JK |
242 | if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) { |
243 | f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING, | |
244 | "Corrupted max_depth of %lu: %u", | |
245 | dir->i_ino, max_depth); | |
246 | max_depth = MAX_DIR_HASH_DEPTH; | |
205b9822 | 247 | f2fs_i_depth_write(dir, max_depth); |
1f6fa261 | 248 | } |
6b4ea016 JK |
249 | |
250 | for (level = 0; level < max_depth; level++) { | |
42d96401 | 251 | *res_page = NULL; |
e7ba108a | 252 | de = find_in_level(dir, level, fname, res_page); |
42d96401 | 253 | if (de || IS_ERR(*res_page)) |
6b4ea016 JK |
254 | break; |
255 | } | |
6e22c691 | 256 | out: |
e7ba108a SL |
257 | return de; |
258 | } | |
259 | ||
260 | /* | |
261 | * Find an entry in the specified directory with the wanted name. | |
262 | * It returns the page where the entry was found (as a parameter - res_page), | |
263 | * and the entry itself. Page is returned mapped and unlocked. | |
264 | * Entry is guaranteed to be valid. | |
265 | */ | |
266 | struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, | |
267 | const struct qstr *child, struct page **res_page) | |
268 | { | |
269 | struct f2fs_dir_entry *de = NULL; | |
270 | struct fscrypt_name fname; | |
271 | int err; | |
272 | ||
273 | err = fscrypt_setup_filename(dir, child, 1, &fname); | |
274 | if (err) { | |
54475f53 EB |
275 | if (err == -ENOENT) |
276 | *res_page = NULL; | |
277 | else | |
278 | *res_page = ERR_PTR(err); | |
e7ba108a SL |
279 | return NULL; |
280 | } | |
281 | ||
282 | de = __f2fs_find_entry(dir, &fname, res_page); | |
283 | ||
0b81d077 | 284 | fscrypt_free_filename(&fname); |
6b4ea016 JK |
285 | return de; |
286 | } | |
287 | ||
288 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
289 | { | |
8be0fea9 | 290 | struct qstr dotdot = QSTR_INIT("..", 2); |
622f28ae | 291 | |
8be0fea9 | 292 | return f2fs_find_entry(dir, &dotdot, p); |
6b4ea016 JK |
293 | } |
294 | ||
835c92d4 | 295 | ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr, |
91246c21 | 296 | struct page **page) |
6b4ea016 JK |
297 | { |
298 | ino_t res = 0; | |
299 | struct f2fs_dir_entry *de; | |
6b4ea016 | 300 | |
91246c21 | 301 | de = f2fs_find_entry(dir, qstr, page); |
6b4ea016 JK |
302 | if (de) { |
303 | res = le32_to_cpu(de->ino); | |
91246c21 CY |
304 | f2fs_dentry_kunmap(dir, *page); |
305 | f2fs_put_page(*page, 0); | |
6b4ea016 JK |
306 | } |
307 | ||
308 | return res; | |
309 | } | |
310 | ||
311 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
312 | struct page *page, struct inode *inode) | |
313 | { | |
59a06155 | 314 | enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA; |
6b4ea016 | 315 | lock_page(page); |
fec1d657 | 316 | f2fs_wait_on_page_writeback(page, type, true); |
6b4ea016 | 317 | de->ino = cpu_to_le32(inode->i_ino); |
510022a8 | 318 | set_de_type(de, inode->i_mode); |
5df1f1da | 319 | f2fs_dentry_kunmap(dir, page); |
6b4ea016 | 320 | set_page_dirty(page); |
6666e6aa | 321 | |
078cd827 | 322 | dir->i_mtime = dir->i_ctime = current_time(dir); |
7c45729a | 323 | f2fs_mark_inode_dirty_sync(dir, false); |
6b4ea016 | 324 | f2fs_put_page(page, 1); |
6b4ea016 JK |
325 | } |
326 | ||
44a83ff6 | 327 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 328 | { |
58bfaf44 | 329 | struct f2fs_inode *ri; |
6b4ea016 | 330 | |
fec1d657 | 331 | f2fs_wait_on_page_writeback(ipage, NODE, true); |
54b591df | 332 | |
53dc9a67 | 333 | /* copy name info. to this inode page */ |
58bfaf44 JK |
334 | ri = F2FS_INODE(ipage); |
335 | ri->i_namelen = cpu_to_le32(name->len); | |
336 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
337 | set_page_dirty(ipage); |
338 | } | |
339 | ||
e7d55452 JK |
340 | int update_dent_inode(struct inode *inode, struct inode *to, |
341 | const struct qstr *name) | |
1cd14caf | 342 | { |
1cd14caf JK |
343 | struct page *page; |
344 | ||
e7d55452 JK |
345 | if (file_enc_name(to)) |
346 | return 0; | |
347 | ||
4081363f | 348 | page = get_node_page(F2FS_I_SB(inode), inode->i_ino); |
1cd14caf JK |
349 | if (IS_ERR(page)) |
350 | return PTR_ERR(page); | |
351 | ||
352 | init_dent_inode(name, page); | |
353 | f2fs_put_page(page, 1); | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
062a3e7b JK |
358 | void do_make_empty_dir(struct inode *inode, struct inode *parent, |
359 | struct f2fs_dentry_ptr *d) | |
360 | { | |
291bf80b CY |
361 | struct qstr dot = QSTR_INIT(".", 1); |
362 | struct qstr dotdot = QSTR_INIT("..", 2); | |
062a3e7b | 363 | |
291bf80b CY |
364 | /* update dirent of "." */ |
365 | f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0); | |
062a3e7b | 366 | |
291bf80b CY |
367 | /* update dirent of ".." */ |
368 | f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1); | |
062a3e7b JK |
369 | } |
370 | ||
44a83ff6 JK |
371 | static int make_empty_dir(struct inode *inode, |
372 | struct inode *parent, struct page *page) | |
39936837 JK |
373 | { |
374 | struct page *dentry_page; | |
375 | struct f2fs_dentry_block *dentry_blk; | |
062a3e7b | 376 | struct f2fs_dentry_ptr d; |
39936837 | 377 | |
622f28ae CY |
378 | if (f2fs_has_inline_dentry(inode)) |
379 | return make_empty_inline_dir(inode, parent, page); | |
380 | ||
44a83ff6 | 381 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
382 | if (IS_ERR(dentry_page)) |
383 | return PTR_ERR(dentry_page); | |
384 | ||
1c3bb978 | 385 | dentry_blk = kmap_atomic(dentry_page); |
39936837 | 386 | |
d8c6822a | 387 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
062a3e7b | 388 | do_make_empty_dir(inode, parent, &d); |
39936837 | 389 | |
1c3bb978 | 390 | kunmap_atomic(dentry_blk); |
39936837 JK |
391 | |
392 | set_page_dirty(dentry_page); | |
393 | f2fs_put_page(dentry_page, 1); | |
394 | return 0; | |
395 | } | |
396 | ||
bce8d112 | 397 | struct page *init_inode_metadata(struct inode *inode, struct inode *dir, |
9421d570 CY |
398 | const struct qstr *new_name, const struct qstr *orig_name, |
399 | struct page *dpage) | |
6b4ea016 | 400 | { |
44a83ff6 JK |
401 | struct page *page; |
402 | int err; | |
403 | ||
91942321 | 404 | if (is_inode_flag_set(inode, FI_NEW_INODE)) { |
a014e037 | 405 | page = new_inode_page(inode); |
44a83ff6 JK |
406 | if (IS_ERR(page)) |
407 | return page; | |
6b4ea016 JK |
408 | |
409 | if (S_ISDIR(inode->i_mode)) { | |
221149c0 JK |
410 | /* in order to handle error case */ |
411 | get_page(page); | |
44a83ff6 | 412 | err = make_empty_dir(inode, dir, page); |
221149c0 JK |
413 | if (err) { |
414 | lock_page(page); | |
415 | goto put_error; | |
416 | } | |
417 | put_page(page); | |
6b4ea016 JK |
418 | } |
419 | ||
bce8d112 | 420 | err = f2fs_init_acl(inode, dir, page, dpage); |
44a83ff6 | 421 | if (err) |
a8865372 | 422 | goto put_error; |
44a83ff6 | 423 | |
9421d570 | 424 | err = f2fs_init_security(inode, dir, orig_name, page); |
8ae8f162 | 425 | if (err) |
a8865372 | 426 | goto put_error; |
fcc85a4d JK |
427 | |
428 | if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) { | |
0b81d077 | 429 | err = fscrypt_inherit_context(dir, inode, page, false); |
fcc85a4d JK |
430 | if (err) |
431 | goto put_error; | |
432 | } | |
6b4ea016 | 433 | } else { |
4081363f | 434 | page = get_node_page(F2FS_I_SB(dir), inode->i_ino); |
44a83ff6 JK |
435 | if (IS_ERR(page)) |
436 | return page; | |
437 | ||
44a83ff6 | 438 | set_cold_node(inode, page); |
6b4ea016 | 439 | } |
44a83ff6 | 440 | |
9421d570 CY |
441 | if (new_name) |
442 | init_dent_inode(new_name, page); | |
44a83ff6 | 443 | |
83d5d6f6 JK |
444 | /* |
445 | * This file should be checkpointed during fsync. | |
446 | * We lost i_pino from now on. | |
447 | */ | |
91942321 | 448 | if (is_inode_flag_set(inode, FI_INC_LINK)) { |
354a3399 | 449 | file_lost_pino(inode); |
50732df0 CY |
450 | /* |
451 | * If link the tmpfile to alias through linkat path, | |
452 | * we should remove this inode from orphan list. | |
453 | */ | |
454 | if (inode->i_nlink == 0) | |
4081363f | 455 | remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); |
a1961246 | 456 | f2fs_i_links_write(inode, true); |
6b4ea016 | 457 | } |
44a83ff6 JK |
458 | return page; |
459 | ||
a8865372 | 460 | put_error: |
221149c0 JK |
461 | clear_nlink(inode); |
462 | update_inode(inode, page); | |
463 | f2fs_put_page(page, 1); | |
44a83ff6 | 464 | return ERR_PTR(err); |
6b4ea016 JK |
465 | } |
466 | ||
dbeacf02 | 467 | void update_parent_metadata(struct inode *dir, struct inode *inode, |
6b4ea016 JK |
468 | unsigned int current_depth) |
469 | { | |
91942321 | 470 | if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) { |
ee6d182f | 471 | if (S_ISDIR(inode->i_mode)) |
a1961246 | 472 | f2fs_i_links_write(dir, true); |
91942321 | 473 | clear_inode_flag(inode, FI_NEW_INODE); |
6b4ea016 | 474 | } |
078cd827 | 475 | dir->i_mtime = dir->i_ctime = current_time(dir); |
7c45729a | 476 | f2fs_mark_inode_dirty_sync(dir, false); |
a18ff063 | 477 | |
ee6d182f | 478 | if (F2FS_I(dir)->i_current_depth != current_depth) |
205b9822 | 479 | f2fs_i_depth_write(dir, current_depth); |
6b4ea016 | 480 | |
91942321 JK |
481 | if (inode && is_inode_flag_set(inode, FI_INC_LINK)) |
482 | clear_inode_flag(inode, FI_INC_LINK); | |
6b4ea016 JK |
483 | } |
484 | ||
a82afa20 | 485 | int room_for_filename(const void *bitmap, int slots, int max_slots) |
6b4ea016 JK |
486 | { |
487 | int bit_start = 0; | |
488 | int zero_start, zero_end; | |
489 | next: | |
a82afa20 JK |
490 | zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); |
491 | if (zero_start >= max_slots) | |
492 | return max_slots; | |
493 | ||
494 | zero_end = find_next_bit_le(bitmap, max_slots, zero_start); | |
6b4ea016 JK |
495 | if (zero_end - zero_start >= slots) |
496 | return zero_start; | |
497 | ||
498 | bit_start = zero_end + 1; | |
499 | ||
a82afa20 JK |
500 | if (zero_end + 1 >= max_slots) |
501 | return max_slots; | |
6b4ea016 JK |
502 | goto next; |
503 | } | |
504 | ||
510022a8 | 505 | void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d, |
3b4d732a CY |
506 | const struct qstr *name, f2fs_hash_t name_hash, |
507 | unsigned int bit_pos) | |
508 | { | |
509 | struct f2fs_dir_entry *de; | |
510 | int slots = GET_DENTRY_SLOTS(name->len); | |
511 | int i; | |
512 | ||
513 | de = &d->dentry[bit_pos]; | |
514 | de->hash_code = name_hash; | |
515 | de->name_len = cpu_to_le16(name->len); | |
516 | memcpy(d->filename[bit_pos], name->name, name->len); | |
510022a8 JK |
517 | de->ino = cpu_to_le32(ino); |
518 | set_de_type(de, mode); | |
7d9dfa1d | 519 | for (i = 0; i < slots; i++) { |
6bf6b267 | 520 | __set_bit_le(bit_pos + i, (void *)d->bitmap); |
7d9dfa1d JK |
521 | /* avoid wrong garbage data for readdir */ |
522 | if (i) | |
523 | (de + i)->name_len = 0; | |
524 | } | |
3b4d732a CY |
525 | } |
526 | ||
675f10bd | 527 | int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name, |
9421d570 | 528 | const struct qstr *orig_name, |
510022a8 | 529 | struct inode *inode, nid_t ino, umode_t mode) |
6b4ea016 JK |
530 | { |
531 | unsigned int bit_pos; | |
532 | unsigned int level; | |
533 | unsigned int current_depth; | |
534 | unsigned long bidx, block; | |
535 | f2fs_hash_t dentry_hash; | |
6b4ea016 | 536 | unsigned int nbucket, nblock; |
6b4ea016 JK |
537 | struct page *dentry_page = NULL; |
538 | struct f2fs_dentry_block *dentry_blk = NULL; | |
3b4d732a | 539 | struct f2fs_dentry_ptr d; |
510022a8 | 540 | struct page *page = NULL; |
675f10bd | 541 | int slots, err = 0; |
622f28ae | 542 | |
6b4ea016 | 543 | level = 0; |
675f10bd CY |
544 | slots = GET_DENTRY_SLOTS(new_name->len); |
545 | dentry_hash = f2fs_dentry_hash(new_name); | |
9ea97163 | 546 | |
6b4ea016 JK |
547 | current_depth = F2FS_I(dir)->i_current_depth; |
548 | if (F2FS_I(dir)->chash == dentry_hash) { | |
549 | level = F2FS_I(dir)->clevel; | |
550 | F2FS_I(dir)->chash = 0; | |
551 | } | |
552 | ||
553 | start: | |
cb78942b | 554 | #ifdef CONFIG_F2FS_FAULT_INJECTION |
55523519 CY |
555 | if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) { |
556 | f2fs_show_injection_info(FAULT_DIR_DEPTH); | |
cb78942b | 557 | return -ENOSPC; |
55523519 | 558 | } |
cb78942b | 559 | #endif |
675f10bd CY |
560 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
561 | return -ENOSPC; | |
6b4ea016 JK |
562 | |
563 | /* Increase the depth, if required */ | |
564 | if (level == current_depth) | |
565 | ++current_depth; | |
566 | ||
38431545 | 567 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
568 | nblock = bucket_blocks(level); |
569 | ||
38431545 JK |
570 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
571 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
572 | |
573 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 574 | dentry_page = get_new_data_page(dir, NULL, block, true); |
675f10bd CY |
575 | if (IS_ERR(dentry_page)) |
576 | return PTR_ERR(dentry_page); | |
6b4ea016 JK |
577 | |
578 | dentry_blk = kmap(dentry_page); | |
a82afa20 JK |
579 | bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, |
580 | slots, NR_DENTRY_IN_BLOCK); | |
6b4ea016 JK |
581 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
582 | goto add_dentry; | |
583 | ||
584 | kunmap(dentry_page); | |
585 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
586 | } |
587 | ||
588 | /* Move to next level to find the empty slot for new dentry */ | |
589 | ++level; | |
590 | goto start; | |
591 | add_dentry: | |
fec1d657 | 592 | f2fs_wait_on_page_writeback(dentry_page, DATA, true); |
6b4ea016 | 593 | |
510022a8 JK |
594 | if (inode) { |
595 | down_write(&F2FS_I(inode)->i_sem); | |
9421d570 CY |
596 | page = init_inode_metadata(inode, dir, new_name, |
597 | orig_name, NULL); | |
510022a8 JK |
598 | if (IS_ERR(page)) { |
599 | err = PTR_ERR(page); | |
600 | goto fail; | |
601 | } | |
e7d55452 JK |
602 | if (f2fs_encrypted_inode(dir)) |
603 | file_set_enc_name(inode); | |
44a83ff6 | 604 | } |
3b4d732a | 605 | |
d8c6822a | 606 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
675f10bd | 607 | f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos); |
3b4d732a | 608 | |
6b4ea016 | 609 | set_page_dirty(dentry_page); |
6666e6aa | 610 | |
510022a8 | 611 | if (inode) { |
205b9822 | 612 | f2fs_i_pino_write(inode, dir->i_ino); |
510022a8 JK |
613 | f2fs_put_page(page, 1); |
614 | } | |
44a83ff6 JK |
615 | |
616 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 617 | fail: |
510022a8 JK |
618 | if (inode) |
619 | up_write(&F2FS_I(inode)->i_sem); | |
d928bfbf | 620 | |
6b4ea016 JK |
621 | kunmap(dentry_page); |
622 | f2fs_put_page(dentry_page, 1); | |
675f10bd CY |
623 | |
624 | return err; | |
625 | } | |
626 | ||
e7ba108a SL |
627 | int __f2fs_do_add_link(struct inode *dir, struct fscrypt_name *fname, |
628 | struct inode *inode, nid_t ino, umode_t mode) | |
629 | { | |
630 | struct qstr new_name; | |
631 | int err = -EAGAIN; | |
632 | ||
633 | new_name.name = fname_name(fname); | |
634 | new_name.len = fname_len(fname); | |
635 | ||
636 | if (f2fs_has_inline_dentry(dir)) | |
637 | err = f2fs_add_inline_entry(dir, &new_name, fname->usr_fname, | |
638 | inode, ino, mode); | |
639 | if (err == -EAGAIN) | |
640 | err = f2fs_add_regular_entry(dir, &new_name, fname->usr_fname, | |
641 | inode, ino, mode); | |
642 | ||
643 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); | |
644 | return err; | |
645 | } | |
646 | ||
675f10bd CY |
647 | /* |
648 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and | |
649 | * f2fs_unlock_op(). | |
650 | */ | |
651 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, | |
652 | struct inode *inode, nid_t ino, umode_t mode) | |
653 | { | |
654 | struct fscrypt_name fname; | |
88c5c13a JK |
655 | struct page *page = NULL; |
656 | struct f2fs_dir_entry *de = NULL; | |
675f10bd CY |
657 | int err; |
658 | ||
659 | err = fscrypt_setup_filename(dir, name, 0, &fname); | |
660 | if (err) | |
661 | return err; | |
662 | ||
88c5c13a JK |
663 | /* |
664 | * An immature stakable filesystem shows a race condition between lookup | |
665 | * and create. If we have same task when doing lookup and create, it's | |
666 | * definitely fine as expected by VFS normally. Otherwise, let's just | |
667 | * verify on-disk dentry one more time, which guarantees filesystem | |
668 | * consistency more. | |
669 | */ | |
670 | if (current != F2FS_I(dir)->task) { | |
671 | de = __f2fs_find_entry(dir, &fname, &page); | |
672 | F2FS_I(dir)->task = NULL; | |
673 | } | |
674 | if (de) { | |
675 | f2fs_dentry_kunmap(dir, page); | |
676 | f2fs_put_page(page, 0); | |
677 | err = -EEXIST; | |
678 | } else if (IS_ERR(page)) { | |
679 | err = PTR_ERR(page); | |
680 | } else { | |
681 | err = __f2fs_do_add_link(dir, &fname, inode, ino, mode); | |
682 | } | |
0b81d077 | 683 | fscrypt_free_filename(&fname); |
6b4ea016 JK |
684 | return err; |
685 | } | |
686 | ||
b97a9b5d JK |
687 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
688 | { | |
689 | struct page *page; | |
690 | int err = 0; | |
691 | ||
692 | down_write(&F2FS_I(inode)->i_sem); | |
9421d570 | 693 | page = init_inode_metadata(inode, dir, NULL, NULL, NULL); |
b97a9b5d JK |
694 | if (IS_ERR(page)) { |
695 | err = PTR_ERR(page); | |
696 | goto fail; | |
697 | } | |
b97a9b5d JK |
698 | f2fs_put_page(page, 1); |
699 | ||
91942321 | 700 | clear_inode_flag(inode, FI_NEW_INODE); |
b97a9b5d JK |
701 | fail: |
702 | up_write(&F2FS_I(inode)->i_sem); | |
d0239e1b | 703 | f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); |
b97a9b5d JK |
704 | return err; |
705 | } | |
706 | ||
9f7c45cc | 707 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode) |
dbeacf02 CY |
708 | { |
709 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
710 | ||
711 | down_write(&F2FS_I(inode)->i_sem); | |
712 | ||
ee6d182f | 713 | if (S_ISDIR(inode->i_mode)) |
a1961246 | 714 | f2fs_i_links_write(dir, false); |
078cd827 | 715 | inode->i_ctime = current_time(inode); |
dbeacf02 | 716 | |
a1961246 | 717 | f2fs_i_links_write(inode, false); |
dbeacf02 | 718 | if (S_ISDIR(inode->i_mode)) { |
a1961246 | 719 | f2fs_i_links_write(inode, false); |
fc9581c8 | 720 | f2fs_i_size_write(inode, 0); |
dbeacf02 CY |
721 | } |
722 | up_write(&F2FS_I(inode)->i_sem); | |
dbeacf02 CY |
723 | |
724 | if (inode->i_nlink == 0) | |
67c3758d | 725 | add_orphan_inode(inode); |
dbeacf02 CY |
726 | else |
727 | release_orphan_inode(sbi); | |
728 | } | |
729 | ||
0a8165d7 | 730 | /* |
e1c42045 | 731 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
732 | * entry in name page does not need to be touched during deletion. |
733 | */ | |
734 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 735 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
736 | { |
737 | struct f2fs_dentry_block *dentry_blk; | |
738 | unsigned int bit_pos; | |
457d08ee | 739 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
740 | int i; |
741 | ||
d0239e1b JK |
742 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
743 | ||
622f28ae CY |
744 | if (f2fs_has_inline_dentry(dir)) |
745 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
746 | ||
6b4ea016 | 747 | lock_page(page); |
fec1d657 | 748 | f2fs_wait_on_page_writeback(page, DATA, true); |
6b4ea016 | 749 | |
1c3bb978 GZ |
750 | dentry_blk = page_address(page); |
751 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 | 752 | for (i = 0; i < slots; i++) |
23380b85 | 753 | __clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); |
6b4ea016 JK |
754 | |
755 | /* Let's check and deallocate this dentry page */ | |
756 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
757 | NR_DENTRY_IN_BLOCK, | |
758 | 0); | |
759 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
760 | set_page_dirty(page); | |
761 | ||
078cd827 | 762 | dir->i_ctime = dir->i_mtime = current_time(dir); |
7c45729a | 763 | f2fs_mark_inode_dirty_sync(dir, false); |
6b4ea016 | 764 | |
dbeacf02 | 765 | if (inode) |
9f7c45cc | 766 | f2fs_drop_nlink(dir, inode); |
6b4ea016 | 767 | |
206e61be CY |
768 | if (bit_pos == NR_DENTRY_IN_BLOCK && |
769 | !truncate_hole(dir, page->index, page->index + 1)) { | |
6b4ea016 | 770 | clear_page_dirty_for_io(page); |
2bca1e23 | 771 | ClearPagePrivate(page); |
6b4ea016 | 772 | ClearPageUptodate(page); |
a7ffdbe2 | 773 | inode_dec_dirty_pages(dir); |
933439c8 | 774 | remove_dirty_inode(dir); |
6b4ea016 | 775 | } |
508198be | 776 | f2fs_put_page(page, 1); |
6b4ea016 JK |
777 | } |
778 | ||
779 | bool f2fs_empty_dir(struct inode *dir) | |
780 | { | |
781 | unsigned long bidx; | |
782 | struct page *dentry_page; | |
783 | unsigned int bit_pos; | |
dbeacf02 | 784 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
785 | unsigned long nblock = dir_blocks(dir); |
786 | ||
622f28ae CY |
787 | if (f2fs_has_inline_dentry(dir)) |
788 | return f2fs_empty_inline_dir(dir); | |
789 | ||
6b4ea016 | 790 | for (bidx = 0; bidx < nblock; bidx++) { |
a56c7c6f | 791 | dentry_page = get_lock_data_page(dir, bidx, false); |
6b4ea016 JK |
792 | if (IS_ERR(dentry_page)) { |
793 | if (PTR_ERR(dentry_page) == -ENOENT) | |
794 | continue; | |
795 | else | |
796 | return false; | |
797 | } | |
798 | ||
1c3bb978 | 799 | dentry_blk = kmap_atomic(dentry_page); |
6b4ea016 JK |
800 | if (bidx == 0) |
801 | bit_pos = 2; | |
802 | else | |
803 | bit_pos = 0; | |
804 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
805 | NR_DENTRY_IN_BLOCK, | |
806 | bit_pos); | |
1c3bb978 | 807 | kunmap_atomic(dentry_blk); |
6b4ea016 JK |
808 | |
809 | f2fs_put_page(dentry_page, 1); | |
810 | ||
811 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
812 | return false; | |
813 | } | |
814 | return true; | |
815 | } | |
816 | ||
ed6bd4b1 | 817 | int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, |
0b81d077 | 818 | unsigned int start_pos, struct fscrypt_str *fstr) |
38594de7 JK |
819 | { |
820 | unsigned char d_type = DT_UNKNOWN; | |
821 | unsigned int bit_pos; | |
822 | struct f2fs_dir_entry *de = NULL; | |
0b81d077 | 823 | struct fscrypt_str de_name = FSTR_INIT(NULL, 0); |
38594de7 | 824 | |
7b3cd7d6 | 825 | bit_pos = ((unsigned long)ctx->pos % d->max); |
38594de7 | 826 | |
7b3cd7d6 JK |
827 | while (bit_pos < d->max) { |
828 | bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos); | |
829 | if (bit_pos >= d->max) | |
38594de7 JK |
830 | break; |
831 | ||
7b3cd7d6 | 832 | de = &d->dentry[bit_pos]; |
7d9dfa1d JK |
833 | if (de->name_len == 0) { |
834 | bit_pos++; | |
835 | ctx->pos = start_pos + bit_pos; | |
836 | continue; | |
837 | } | |
838 | ||
675f10bd | 839 | d_type = get_de_type(de); |
d8c6822a | 840 | |
d8c6822a JK |
841 | de_name.name = d->filename[bit_pos]; |
842 | de_name.len = le16_to_cpu(de->name_len); | |
843 | ||
844 | if (f2fs_encrypted_inode(d->inode)) { | |
845 | int save_len = fstr->len; | |
ef1eb3aa | 846 | int err; |
d8c6822a | 847 | |
ef1eb3aa | 848 | err = fscrypt_fname_disk_to_usr(d->inode, |
0b81d077 JK |
849 | (u32)de->hash_code, 0, |
850 | &de_name, fstr); | |
ef1eb3aa | 851 | if (err) |
ed6bd4b1 | 852 | return err; |
569cf187 JK |
853 | |
854 | de_name = *fstr; | |
855 | fstr->len = save_len; | |
d8c6822a JK |
856 | } |
857 | ||
858 | if (!dir_emit(ctx, de_name.name, de_name.len, | |
38594de7 | 859 | le32_to_cpu(de->ino), d_type)) |
ed6bd4b1 | 860 | return 1; |
38594de7 JK |
861 | |
862 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
863 | ctx->pos = start_pos + bit_pos; | |
864 | } | |
ed6bd4b1 | 865 | return 0; |
38594de7 JK |
866 | } |
867 | ||
6f7f231e | 868 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 869 | { |
496ad9aa | 870 | struct inode *inode = file_inode(file); |
6b4ea016 | 871 | unsigned long npages = dir_blocks(inode); |
6b4ea016 | 872 | struct f2fs_dentry_block *dentry_blk = NULL; |
6b4ea016 | 873 | struct page *dentry_page = NULL; |
817202d9 | 874 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 875 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
7b3cd7d6 | 876 | struct f2fs_dentry_ptr d; |
0b81d077 | 877 | struct fscrypt_str fstr = FSTR_INIT(NULL, 0); |
d8c6822a | 878 | int err = 0; |
6b4ea016 | 879 | |
d8c6822a | 880 | if (f2fs_encrypted_inode(inode)) { |
0b81d077 | 881 | err = fscrypt_get_encryption_info(inode); |
8074bb51 | 882 | if (err && err != -ENOKEY) |
26bf3dc7 JK |
883 | return err; |
884 | ||
0b81d077 | 885 | err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr); |
d8c6822a JK |
886 | if (err < 0) |
887 | return err; | |
888 | } | |
889 | ||
890 | if (f2fs_has_inline_dentry(inode)) { | |
891 | err = f2fs_read_inline_dir(file, ctx, &fstr); | |
892 | goto out; | |
893 | } | |
622f28ae | 894 | |
817202d9 CY |
895 | /* readahead for multi pages of dir */ |
896 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
897 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
898 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
899 | ||
6c311ec6 | 900 | for (; n < npages; n++) { |
a56c7c6f | 901 | dentry_page = get_lock_data_page(inode, n, false); |
57b62d29 CY |
902 | if (IS_ERR(dentry_page)) { |
903 | err = PTR_ERR(dentry_page); | |
ed6bd4b1 CY |
904 | if (err == -ENOENT) { |
905 | err = 0; | |
57b62d29 | 906 | continue; |
ed6bd4b1 | 907 | } else { |
57b62d29 | 908 | goto out; |
ed6bd4b1 | 909 | } |
57b62d29 | 910 | } |
6b4ea016 | 911 | |
6b4ea016 | 912 | dentry_blk = kmap(dentry_page); |
99b072bb | 913 | |
d8c6822a | 914 | make_dentry_ptr(inode, &d, (void *)dentry_blk, 1); |
7b3cd7d6 | 915 | |
ed6bd4b1 CY |
916 | err = f2fs_fill_dentries(ctx, &d, |
917 | n * NR_DENTRY_IN_BLOCK, &fstr); | |
918 | if (err) { | |
e9837bc2 CY |
919 | kunmap(dentry_page); |
920 | f2fs_put_page(dentry_page, 1); | |
921 | break; | |
922 | } | |
38594de7 | 923 | |
6f7f231e | 924 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
925 | kunmap(dentry_page); |
926 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 | 927 | } |
d8c6822a | 928 | out: |
0b81d077 | 929 | fscrypt_fname_free_buffer(&fstr); |
ed6bd4b1 | 930 | return err < 0 ? err : 0; |
6b4ea016 JK |
931 | } |
932 | ||
ed3360ab CY |
933 | static int f2fs_dir_open(struct inode *inode, struct file *filp) |
934 | { | |
935 | if (f2fs_encrypted_inode(inode)) | |
0b81d077 | 936 | return fscrypt_get_encryption_info(inode) ? -EACCES : 0; |
ed3360ab CY |
937 | return 0; |
938 | } | |
939 | ||
6b4ea016 JK |
940 | const struct file_operations f2fs_dir_operations = { |
941 | .llseek = generic_file_llseek, | |
942 | .read = generic_read_dir, | |
e77d0c63 | 943 | .iterate_shared = f2fs_readdir, |
6b4ea016 | 944 | .fsync = f2fs_sync_file, |
ed3360ab | 945 | .open = f2fs_dir_open, |
6b4ea016 | 946 | .unlocked_ioctl = f2fs_ioctl, |
08b95126 | 947 | #ifdef CONFIG_COMPAT |
948 | .compat_ioctl = f2fs_compat_ioctl, | |
949 | #endif | |
6b4ea016 | 950 | }; |